Pipe friction & head loss worksheet with answers

Free printable Pipe friction & head loss worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy
V = 2.75 m/sD = 75 mmρ = 891 kg/m³, μ = 0.29 Pa·s

SAE 30 motor oil (ρ = 891 kg/m³, μ = 0.29 Pa·s) flows at 2.75 m/s through a pipe with an inside diameter of 75 mm. Find the Reynolds number Re.

ρ = 891 kg/m³μ = 0.29 Pa·sV = 2.75 m/sD = 75 mm
Re =
2.Easy
Q = 15 L/sD = 150 mmν = 1.31 × 10⁻⁶ m²/s

Water at 10 °C (ν = 1.31 × 10⁻⁶ m²/s) flows through a pipe with an inside diameter of 150 mm at 15 L/s. Find the Reynolds number Re.

Q = 15 L/sD = 150 mmν = 1.31 × 10⁻⁶ m²/s
Re =
3.Medium
V = 2.8 m/sD = 50 mmL = 100 mf = 0.022

Water (ρ = 1000 kg/m³) flows at 2.8 m/s through a horizontal pipe, 100 m long, with an inside diameter of 50 mm. Use the Darcy friction factor f = 0.022 and g = 9.81 m/s². Find the pressure drop Δp over the pipe in kPa.

V = 2.8 m/sL = 100 mD = 50 mmf = 0.022ρ = 1000 kg/m³
Δp = kPa
4.Medium
V = 1.9 m/sD = 100 mmL = 400 mf = 0.015

Water (ρ = 1000 kg/m³) flows at 1.9 m/s through a horizontal pipe, 400 m long, with an inside diameter of 100 mm. Use the Darcy friction factor f = 0.015 and g = 9.81 m/s². Find the pressure drop Δp over the pipe in kPa.

V = 1.9 m/sL = 400 mD = 100 mmf = 0.015ρ = 1000 kg/m³
Δp = kPa
5.Hard
K = 10Δz = 34 mL = 150 m, D = 300 mm, f = 0.0153× bend (K = 0.3)

Two open reservoirs are joined by a pipe 150 m long with an inside diameter of 300 mm and a Darcy friction factor f = 0.015. The water surface of the upper reservoir is 34 m above that of the lower one. The minor losses are a square-edged entrance (K = 0.5), 3 bends (K = 0.3 each), a valve (K = 10) and the exit into the lower reservoir (K = 1.0). Use g = 9.81 m/s². Find the flow rate Q in L/s.

Δz = 34 mL = 150 mD = 300 mmf = 0.015Kentrance = 0.5Kbend = 0.3 (×3)Kvalve = 10Kexit = 1.0
Q = L/s
6.Hard
K = 10Δz = 23 mL = 200 m, D = 150 mm, f = 0.0224× bend (K = 0.3)

Two open reservoirs are joined by a pipe 200 m long with an inside diameter of 150 mm and a Darcy friction factor f = 0.022. The water surface of the upper reservoir is 23 m above that of the lower one. The minor losses are a square-edged entrance (K = 0.5), 4 bends (K = 0.3 each), a valve (K = 10) and the exit into the lower reservoir (K = 1.0). Use g = 9.81 m/s². Find the flow rate Q in L/s.

Δz = 23 mL = 200 mD = 150 mmf = 0.022Kentrance = 0.5Kbend = 0.3 (×4)Kvalve = 10Kexit = 1.0
Q = L/s

Answer key

  1. 1. Re = 633.7
  2. 2. Re = 97194
  3. 3. Δp = 172.5 kPa
  4. 4. Δp = 108.3 kPa
  5. 5. Q = 409.3 L/s
  6. 6. Q = 57.9 L/s

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